One attackers named as 29-year-old Omar Ismail Mostefai, a Frenchman who was flagged for Islamic radicalism links

Police leave cancelled and around 1,500 soldiers mobilised

French border controls increased, state of emergency declared

Seven extremists in three teams carried out attacks, all wearing identical suicide belts, all killed

Manhunt under way for accomplices, arrests made in Brussels after police raids

UK police say they will strengthen presence at ports and on the streets

The Briton killed in the terror attacks in Paris "died a hero", friends have said, as it is feared more UK citizens may have also lost their lives.

Nick Alexander, 36, was shot at the Bataclan theatre, where the attackers stormed a concert by an American rock group and took hostages, leaving 89 dead.

A total of 129 people were killed and 352 injured in the co-ordinated shooting and bombing attacks and many remain in critical condition.

Islamic State has claimed responsibility for the attack, carried out by seven extremists who wore identical suicide belts.

The Foreign Office has said a "handful" of Britons could be dead, though Mr Alexander remains the only one confirmed.

Nick Alexander

Helen Wilson, a friend of Mr Alexander's, who was with him, told The Telegraph: "Nick was shot in front of me."

She described how they went down on the floor when the gunmen entered and started shooting people who tried to flee.

She said: “Nick was in front of me when we were lying on the ground and somebody moved and they just turned round and started shooting us.

“His back was to me and I couldn’t see what happened and I tried to keep him talking and then I tried to give him mouth-to-mouth resuscitation... He couldn’t breathe any more and I held him in my arms and told him I loved him. He was the love of my life.”